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Hardware and Performance / Help with High CPU Usage in OPNSense VM inside Proxmox
« on: June 08, 2024, 03:30:22 pm »
Hi everyone,
I'm experiencing an issue with high CPU usage in my OPNSense VM running inside Proxmox and could really use some help.
Setup Details:
Host Configuration:
Proxmox Host
64 GB RAM
Intel i7-8700 (mitigations=off)
IOMMU enabled (iommu=on and iommu=pt in /etc/kernel/cmdline)
Proxmox installed on SSD NVME in ZFS RAID0
VM Configuration:
OPNSense VM
8GB RAM
1 socket, 4 CPU threads (using host cpu type, testing with others doesn't change anything)
Passing through 4 ports of Intel I226V 2.5GbE. PCI-E is on in the settings of pci devices.
Q35, OVMF (UEFI)
Issue:
When I run a speed test, downloading at speeds of 2.1 Gbps to 2.5 Gbps, Proxmox reports 80-100% CPU usage. However, inside the OPNSense dashboard, the CPU usage is reported as 5-20%. (Same tested with pfsense)
I’m trying to understand why the CPU usage is so high on Proxmox.
Things I've Tried:
Ensured that IOMMU is enabled and configured properly.
Verified that CPU mitigations are turned off for performance.
Tested with Pfsense
Tested OpenWRT and the CPU Usage doesn't go above 10-15% at full 2.5Gb speed so this is a problem with the senses...
Questions:
Why is there such a discrepancy between CPU usage reported by Proxmox and OPNSense?
Is there anything I can do to optimize or reduce the CPU usage on Proxmox when running high-speed network tasks?
Any insights or suggestions would be greatly appreciated!
Thanks in advance!
I'm experiencing an issue with high CPU usage in my OPNSense VM running inside Proxmox and could really use some help.
Setup Details:
Host Configuration:
Proxmox Host
64 GB RAM
Intel i7-8700 (mitigations=off)
IOMMU enabled (iommu=on and iommu=pt in /etc/kernel/cmdline)
Proxmox installed on SSD NVME in ZFS RAID0
VM Configuration:
OPNSense VM
8GB RAM
1 socket, 4 CPU threads (using host cpu type, testing with others doesn't change anything)
Passing through 4 ports of Intel I226V 2.5GbE. PCI-E is on in the settings of pci devices.
Q35, OVMF (UEFI)
Issue:
When I run a speed test, downloading at speeds of 2.1 Gbps to 2.5 Gbps, Proxmox reports 80-100% CPU usage. However, inside the OPNSense dashboard, the CPU usage is reported as 5-20%. (Same tested with pfsense)
I’m trying to understand why the CPU usage is so high on Proxmox.
Things I've Tried:
Ensured that IOMMU is enabled and configured properly.
Verified that CPU mitigations are turned off for performance.
Tested with Pfsense
Tested OpenWRT and the CPU Usage doesn't go above 10-15% at full 2.5Gb speed so this is a problem with the senses...
Questions:
Why is there such a discrepancy between CPU usage reported by Proxmox and OPNSense?
Is there anything I can do to optimize or reduce the CPU usage on Proxmox when running high-speed network tasks?
Any insights or suggestions would be greatly appreciated!
Thanks in advance!